ADC	arginine decarboxylase
AISI	(neutrophils × monocytes × platelets)/lymphocyte ratio
AO-Agm	isosteric-agmatine hydroxylamine analogue
APAO	acetylated polyamine oxidase
ASAP	Atypical Small Acinar Proliferation
AUC	area under the curve
BPH	benign prostatic hyperplasia
Cad	cadaverine
CTC	circulating cancer cells
1,3-DAP	1,3-diaminopropane
dcAdoMet	decarboxylated S-adenosyl-l-methionine
DRE	digital rectal examination
HBFA	heptafluorobutyric acid
IIEF	international index of erectile function
IPSS	international prostatic symptoms score
LC-HRMS	Liquid Chromatography-High Resolution Mass Spectrometry
LDC	lysine decarboxylase
MAD	median ± median absolute deviation
MLR	monocyte/lymphocyte ratio
NLR	neutrophil/lymphocyte ratio
dNLR	derived NLR [dNLR = neutrophils/(white blood cells − neutrophils)]
NO	nitric oxide
ODC	ornithine decarboxylase
OPLS-DA	orthogonal partial discriminant analysis of the minimum squares
Orn	ornithine
PAs	polyamines
PAOs	polyamine oxidases
PC	prostate cancer
PHI	prostate health index
PIN	prostatic intraepithelial neoplasia
PL	precancerous lesion
PLR	platelet/lymphocyte ratio
PLS-DA	partial least squares discriminant analysis
PSA	prostate-specific antigen
fPSA	free PSA
proPSA	PSA precursors
tPSA	total PSA
Put	putrescine
QC	quality control
ROC	receiver operational characteristics curve
SIRI	(neutrophils × monocytes)/lymphocyte ratio
Spd	spermidine
SpdS	spermidine synthase
Spm	spermine
SpmS	spermine synthase
SSAT	spermidine/spermine acetyltransferase
TRUS	trans rectal ultrasound
VIP	variable importance parameter